During its first five days on the shelves, Activision's latest installment in the first-person-shooter video game franchise Call Of Duty brought in $550 million worldwide. What are the reasons for its popularity?

Somehow knows names and places of battles that are set to take place in the next few weeks

Multiplayer mode enables you to connect with friends, nonstop action prevents them from drawing you into meaningful conversation

5,000 or more hours of game play qualifies player for VA health care

Not much good on TV

When you shoot barrels, they explode

The controller rumbles when your character is hit with a bullet, which is exactly what the human body does

Dutiful young Americans realizing just what they are being called to do